fix bug that passing invalid fd to fstats on win32 builds

lfd returned by adb_open is not the actual file desc.
on win32 builds. calling through fstat with invalid fd
will lead to crash, using stat instead.

Change-Id: I7fdc8b825162eaa42efe8755265842c300b00e39
Signed-off-by: eric.yan <eric.yan@yulong.com>
Signed-off-by: severecold <severecold@gmail.com>